a. rare. [f. L. caverna cavern + -AL.] Pertaining to, or of the nature of, a cavern.
1803. G. S. Faber, Cabiri, II. 266. Hades may be the cavernal space immediately beneath the shell of the earth. Ibid. (1816), Orig. Pagan Idol., I. p. lxx. The two-peaked mountain and sacred cavernal door.
